Earth(also called Gaia and World) is the third planet from the sun. It is also the only planet known to have life. It is also the largest planet of the Solar System's four terrestrial planets. It's inhabitants are called Humans(or homo sapiens) Life appeared on Earth 3.5 billion years ago. The population on Earth is 7 billion humans.
Earth is believed to have been ''born'' in 4.5 billion years.